#include "reg52.h"

void delay(int z)
{
	int x,y;
	for(x=z;x>0;x--)
		for(y=0;y<112;y++);
}

void main()
{
	while(1)
	{
		P0 =  0x00;
		delay(2);
		P0 =  0xFF;
		delay(2);
	}
}